/*
 * Copyright (C) 2013 Square, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.squareup.picasso;

import android.graphics.Bitmap;

/** Image transformation. */
public interface Transformation {
	/**
	 * Transform the source bitmap into a new bitmap. If you create a new bitmap
	 * instance, you must call {@link android.graphics.Bitmap#recycle()} on
	 * {@code source}. You may return the original if no transformation is
	 * required.
	 */
	Bitmap transform(Bitmap source);

	/**
	 * Returns a unique key for the transformation, used for caching purposes.
	 * If the transformation has parameters (e.g. size, scale factor, etc) then
	 * these should be part of the key.
	 */
	String key();
}
